LIVE UPDATES
Trump shooting live updates: Suspected gunman purchased 50 rounds on day of shooting
One spectator was killed and two were hurt in Saturday's shooting.
Federal authorities are investigating after former President Donald Trump was shot in the ear in an assassination attempt at an election rally in Butler, Pennsylvania, on Saturday.
Blood splattered on Trump's face as Secret Service agents surrounded him and led him off the stage to a waiting vehicle to whisk him away. Trump is "fine," a spokesperson said.
The alleged shooter was killed by snipers. One spectator was killed and two were hurt, officials said.
Latest headlines:
What we know about the shooting
The federal investigation into the attempted assassination of former President Donald Trump is focused on the suspected gunman's motives for the crime and whether he was aided by others. Read more here.
Secret Service director to address House Oversight Committee on July 22
Secret Service Director Kim Cheatle will address the GOP-led House Committee on Oversight and Accountability at 10 a.m. on Monday, July 22.
"The United States Secret Service has a no-fail mission, yet it failed on Saturday," committee Chairman James Comer, R-Ky., said in a statement Monday.
"Americans demand answers from Director Kimberly Cheatle about these security lapses and how we can prevent this from happening again," he said.
Building where gunman was found was officer staging area
The building where gunman Thomas Crooks scrambled onto the roof and opened fire was the staging area for the local police tactical team doing overwatch of the crowd, two law enforcement officials told ABC News.
Sources previously told ABC News that the building had been swept, but investigators are trying to determine whether roof access had been properly locked down.
The gunman gained roof access without a ladder, according to a source briefed on the preliminary findings.
-ABC News' Josh Margolin and Aaron Katersky
Police looked toward roof full minute before shots fired, video shows
New video licensed by ABC News shows police investigating near the building where the gunman was perched on the roof a full minute before shots rang out.
In one video, at approximately 6:10 p.m. and 26 seconds, police look onto the roof as a man in white shorts points toward the building.
The next clip begins just before 6:11 p.m. Bystanders are seen fleeing the area and the first gunshots are heard about 30 seconds into the video.
-ABC News’ Victor Ordoñez and Christopher Looft
Security planners reassessed plans for Biden's visit to Vegas
Security planners have reassessed and reexamined their plans for President Joe Biden’s visit to Las Vegas this week in light of Saturday's shooting, a senior official briefed on the matter told ABC News.
Officials expect that there will be a heightened level of security and additional federal agents on site in Las Vegas, the official said.
Biden will be in Las Vegas from Monday to Wednesday for several events.
-ABC News’ Josh Margolin